What is the weather like in Half Moon Bay vs San Francisco in December?

In December, Half Moon Bay averages 14°C high / 7°C low with about 186 mm of rain; San Francisco averages 15°C high / 9°C low with about 121 mm.

Half Moon Bay vs San Francisco in December

San Francisco is the better pick in December — 67 vs 50 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Half Moon Bay is cool, soaked, muggy air.

Half Moon Bay vs San Francisco — December climate, side by side

	🇺🇸 Half Moon Bay	🇺🇸 San Francisco
Comfort score	50/100 (D)	67/100 (C)
Feels-like high	14°C	13°C
Avg high / low	14° / 7°	15° / 9°
Rainfall	186 mm	121 mm
Rainy days	13	9
Humidity	85%	82%
Air quality (AQI)	57	50

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Half Moon Bay vs San Francisco in December — FAQ

Is December better in Half Moon Bay or San Francisco?: San Francisco is the better pick in December — 67 vs 50 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Half Moon Bay is cool, soaked, muggy air.
What is the weather like in Half Moon Bay vs San Francisco in December?: In December, Half Moon Bay averages 14°C high / 7°C low with about 186 mm of rain; San Francisco averages 15°C high / 9°C low with about 121 mm.